EP0813159A2 - Procédé et dispositif pour le téléchargement prioritoire d'objets web encastrés - Google Patents

Procédé et dispositif pour le téléchargement prioritoire d'objets web encastrés Download PDF

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Publication number
EP0813159A2
EP0813159A2 EP97303915A EP97303915A EP0813159A2 EP 0813159 A2 EP0813159 A2 EP 0813159A2 EP 97303915 A EP97303915 A EP 97303915A EP 97303915 A EP97303915 A EP 97303915A EP 0813159 A2 EP0813159 A2 EP 0813159A2
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EP
European Patent Office
Prior art keywords
information element
computer
mechanism configured
bandwidth
file
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97303915A
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German (de)
English (en)
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EP0813159B1 (fr
EP0813159A3 (fr
Inventor
Jakob Nielsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sun Microsystems Inc
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Sun Microsystems Inc
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Filing date
Publication date
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Publication of EP0813159A2 publication Critical patent/EP0813159A2/fr
Publication of EP0813159A3 publication Critical patent/EP0813159A3/fr
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Publication of EP0813159B1 publication Critical patent/EP0813159B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/958—Organisation or management of web site content, e.g. publishing, maintaining pages or automatic linking
    • G06F16/986—Document structures and storage, e.g. HTML extensions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99933—Query processing, i.e. searching
    • Y10S707/99935—Query augmenting and refining, e.g. inexact access
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99937—Sorting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99941—Database schema or data structure
    • Y10S707/99944—Object-oriented database structure
    • Y10S707/99945—Object-oriented database structure processing

Definitions

  • the present invention relates to an improved method and system for retrieving and acting on information elements in a computer network.
  • Embodiments of the present invention offer a more flexible approach to ameliorating the response time problem by downloading web objects based on a priority attribute associated with each object reference in the web file.
  • Embodiments of the present invention provide an improved method and system for acting on information elements in a computer network.
  • the information elements are web objects referenced in an HTML file.
  • a web object may be, but is not limited to, text, a graphical user interface element, an image file, an audio file, an applet, or other computer code.
  • "Acting on” the information element typically includes, but is not limited to, displaying the text, displaying the graphical user interface element, displaying the image file, playing the audio file, executing the applet, or executing other computer code.
  • the method retrieves a web file and sorts one or more web object references according to a priority attribute associated with each web object reference. After ranking the web object references by priority, the method then retrieves each web object in the order that their references were ranked. After receiving a web object, a user acts upon the web object in the appropriate manner.
  • the web object references are sorted using a two-step process.
  • the web object references are ordered into an initial list and are assigned a sequence number according to the sequence of their appearance in the file.
  • the list is then reordered by descending priority level as a primary sort key and by ascending sequence number as a secondary sort key. In this way objects with a higher priority will be sorted to the top of the list and objects with the same priority will be sorted such that the objects referenced early in the web file are sorted above those objects referenced later in the file.
  • the web objects are retrieved in parallel in order to decrease retrieval time.
  • the method determines whether at least one web object is currently being retrieved. If an object is currently being retrieved then the following steps are preferably followed to facilitate parallel retrieval of another web object.
  • the method obtains an indication of an available rate of incoming bandwidth to the client computer and also obtains an indication of an available rate of outgoing bandwidth to the server computer storing the web object.
  • the method determines a minimum rate of the available incoming bandwidth and the available outgoing bandwidth.
  • the method accepts data associated with the next information element at a rate corresponding to a selected increment over the minimum rate. In this way, the overall rate of retrieval is increased.
  • a method is here, and generally, conceived to be a self-consistent sequence of steps leading to a desired result. These steps require physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of electrical or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated. It proves convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like. It should be bourne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities.
  • Useful machines for performing the operations of the present invention include general purpose digital computers or similar devices.
  • the general purpose computer may be selectively activated or reconfigured by a computer program stored in the computer.
  • a special purpose computer may also be used to perform the operations of the present invention.
  • use of the methods described and suggested herein is not limited to a particular computer configuration.
  • Figure 1 is a block diagram of a computer network within which embodiments of the present invention can operate.
  • Figure 2 is an example of a series of HTML document tags forming a template for a typical hypertext document.
  • Figure 3 summarizes, in a table, the HTML tags used to create the HTML template document.
  • Figure 4 illustrates a hypertext document on Thomas Jefferson with a hot link for "the American Constitution”.
  • FIG. 5 illustrates the primary components of a Universial Resource Locator ("URL").
  • URL Universial Resource Locator
  • Figure 6 is a flow diagram which illustrates the preferred steps for retrieving and acting on information elements referenced in a file.
  • Figure 7 is a flow diagram which illustrates the preferred steps for retrieving remotely stored web objects.
  • Figure 8 illustrates the preferred steps for retrieving web objects in parallel.
  • the method retrieves a file and sorts one or more information element references according to a priority attribute associated with each reference. After ranking the information element references by priority, the method then retrieves each information element in the order that their references were ranked. After receiving an information element, a user acts upon the information element in the appropriate manner. Typical information elements, and their actions, would include displaying an image file, executing an applet, or playing an audio file. By using the steps of the preferred method, more important information elements are retrieved before less important information elements, thus allowing the user to act upon the more important information elements sooner than the user could have acted on the important information elements using methods available in the prior art.
  • the file will be referred to as a web file and the information elements will be referred to as objects or web objects.
  • the invention is not, however, limited to use with web files and web objects.
  • FIG. 1 is a block diagram of a computer network within which embodiments of the present invention can operate.
  • Computer system 100 includes a processor 102 which fetches computer instructions from a primary storage 104 or a cache 105 through a bus 106 and executes those computer instruction.
  • processor 102 can retrieve data from or write data to primary storage 104, display information on one or more computer display devices 120, receive command signals from one or more user-input devices 130, or transfer data to other computer systems which collectively form a computer network (not shown).
  • Processor 102 can be, for example, any of the SPARC processors available form Sun Microsystems, Inc.
  • primary storage 104 can include any type of computer primary storage including, without limitation, randomly accessible memory (RAM), read-only memory (ROM), and storage devices which include magnetic and optical storage media such as magnetic or optical disks.
  • Computer display devices 120 can include, for example, printers and computer display screens such as cathode-ray tubes (CRTs), light-emitting diode (LED) displays, and liquid crystal displays (LCDs).
  • User-input devices 130 can include without limitation electronic keyboards and pointing devices such as electronic mice, trackballs, lightpens, thumb-wheels, digitizing tablets, and touch sensitive pads.
  • Computer system 100 can be, e.g., any of the SPARCstation workstation computer systems available form Sun Microsystems, Inc. of Mountain View, California, any other Macintosh computer systems based on the PowerPC processor and available from Apple Computers, Inc. of Cuptertino, California, or any computer system compatible with the IBM PC computer systems available form International Business Machines, Corp of Somers, New York, which are based on the X86 series of processors available from Intel Corporation or compatible processors.
  • Sun, Sun Microsystems, and the Sun Logo are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. All SPARC trademarks are used under license and are trademarks of SPARC International, Inc. in the United States and other countries. Products bearing SPARC trademarks are based upon an architecture developed by Sun Microsystems, Inc.
  • Runtime environment 112 is generally a set of computer programs which enable computer system 100 to understand and process commands, control input and output of computer system 100 through user-input devices 130 and computer display devices 120, schedule computer processes for execution, manage data stored in various storage elements of primary storage 104 of computer system 100, and control the operation of peripheral devices (such as secondary storage 140) coupled to computer system 100.
  • runtime environment 112 may be an operating system or an operating system with a kernel.
  • the preferred operating system is the Solaris operating system from Sun Microsystems, Inc., of Mountain View, California.
  • the kernel of an operating system is that portion of the operating system which manages the interface between computer processes (e.g., web browser 108) and user-input devices 130 and computer display devices 120, manages primary storage 104, schedules computer processes for execution, and maintains a file system which in turn manages storage of data (e.g., web file 110) on various storage elements of printary storage 104.
  • computer processes e.g., web browser 108
  • manages primary storage 104 schedules computer processes for execution, and maintains a file system which in turn manages storage of data (e.g., web file 110) on various storage elements of printary storage 104.
  • Un and Solaris are trademarks or registered trademarks of Sun Microsystems,Inc., in the United States and other countries.
  • the preferred web file 110 is written in HTML, although any language which supports hypertext could be used.
  • HTML markup language is analogous in some ways to the formatting codes used in word processing documents.
  • a word processing document viewed through a word processing program is actually a combination of the text that you see and a series of hidden formatting codes (e.g., the carriage return, bold, and underline codes) which instruct the word processing program to display the word processing document in a specified way.
  • a hypertext document is actually a combination of the text that you see and a series of hidden “tags” or “anchors” (e.g., tags for new paragraphs, graphic images, hypertext links, etc.) which instruct the browser program to display the hypertext document in a specified way.
  • tags e.g., tags for new paragraphs, graphic images, hypertext links, etc.
  • a hypertext document is usually broken down into sections, with each section delineated by one or more HTML tags.
  • HTML tags are formatting codes surrounded by the characters " ⁇ " and ">" (i.e., less than and greater than symbols).
  • Some HTML tags have a start tag and an end tag.
  • end tags are in the format ⁇ /"symbol”> where the "symbol” is the character string found between the characters ⁇ and > in the start tag.
  • Figure 2 is an example of a series of HTML document tags forming a template for a typical hypertext document.
  • the document of Figure 2 is defined as an HTML document using the tags ⁇ html> and ⁇ /html>.
  • the "head” to the document which typically includes a title, is defined using the tags ⁇ head>, ⁇ /head>, ⁇ title>, and ⁇ /title>, respectively.
  • the "body” of the document which is often organized into subtopics with different levels of headings.
  • the body is defined by the tags ⁇ body> and ⁇ /body>.
  • Headings are indicated by the tags ⁇ h#> and ⁇ /h#>, where# is the level of the heading. Heading levels indicate the relative see of the heading. Heading level 1 is the largest heading size and heading level 6 is the smallest heading size.
  • Figure 3 summarizes, in a table, the HTML tags used to create the HTML template document.
  • HTML template Once the HTML template has been established, text is added to create a basic hypertext document.
  • the author adds HTML character and paragraph formatting tags to the document. For example, the ⁇ p> tag instructs the browser to begin a new paragraph. If an author wants to highlight some text in bold, the author inserts the ⁇ b> tag at the begining of the text to be highlighted and inserts a ⁇ /b> tag at the end of the text to be highlighted.
  • the tags ⁇ i> and ⁇ /i> indicate text to display in italics.
  • a hot link to a destination document is made by placing a "reference anchor" around the text to be highlighted (e.g., "the American Constitution") and then providing a network location where the destination document is located.
  • Reference anchors extend the idea of start and end tags.
  • a reference anchor is created when the start tag ⁇ a> and the end tag ⁇ /a> are placed around the text to be highlighted (e.g., ⁇ a> the American Constitution ⁇ /a>).
  • attribute information that identifies the network location of the destination document is inserted within the ⁇ a> reference tag.
  • URL Universal Resource Locator
  • FIG. 5 illustrates the primary components of a URL.
  • a service type 501 is a required part of a URL. The service type tells the user's browser how to contact the server for the requested data. The most common service type is the HyperText Transport Protocol or http. The web can handle several other services including gopher, wais, ftp, netnews, and telnet and can be extended to handle new service types.
  • a system name 503 is also a required part of a URL. The system name is the fully qualified domain name of the server which stores the data being requested.
  • a port 505 ia an optional part of a URL. Ports are the network socket addresses for specific protocols. By default, http connects at port 80. Ports are only needed when the server does not communicate on the default port for that service.
  • a directory path 507 is a required part of a URL. Once connected to the system in question, a path to the file must be specified.
  • a filename 509 is an optional part of a URL. The file name is the data file itself. The server can be configured so that if a filename isn't specified, a default file or directory listing is returned.
  • a search component 511 is another optional part of a URL. If the URL is a request to search a data base, the query can be embedded in the URL. The search component is the text after the ? or # in a URL.
  • embodiments of the present invention extend the idea of anchors and tags by inserting a "PRIORITY" attribute into existing anchor and tag formats.
  • the PRIORITY attribute should be set equal to a number (either negative, positive, or zero). If the value of a PRIORITY attribute is not a number then the browser 108 assumes that the priority of that embedded object is zero.
  • the embedded objects will preferably be downloaded following the steps illustrated in Figures 6, 7, and 8, and described in detail below.
  • computer network 10 also includes a network connection 145 for facilitating communication between host computer system 100 and server(s) 150.
  • Network connection 145 can be any well know mechanism for facilitating communication between computers, such as, without limitation, a local area network, a wide area network, the Internet, or any of the well known wireless communication systems.
  • Server(s) 150 typically store the information elements that are referenced in the web file 110 and are retrieved using the teachings and suggestions of the present invention.
  • FIG. 6 is a flow diagram which illustrates the preferred steps for retrieving and acting on web objects referenced in a web file.
  • the browser reads the web file and displays the text on the screen following the well-established prior art methods for web-page display. This method involves leaving space on the page for embedded objects that need space (typically images and applets). If the object has WIDTH and HEIGHT attributes, then the amount of space reserved for the object is that specified by these attributes and otherwise, the space is initially set equal to the size of an icon (typically 32 by 32 pixels) and later adjusted to the actual size of the object when it has been downloaded (adjusting the space may involve moving subsequent parts of the page either up or down, depending on whether the initially reserved space was too large or too small).
  • step 603 the browser determines if any web objects referenced by the web file are stored in its cache. If cached web objects exist then, in step 605, the browser determines if unprocessed cached web objects remain to be processed. If unprocessed web objects remain then, in step 607, the browser retrieves the next web object that is available in its cache. In step 609, the browser acts on the retrieved web object.
  • "acting on an object” means displaying it if it is an image file, playing it if it is a audio file, and executing it if it is an applet or computer code, but the exact action to take is dependent on the media type of the object and follows prior art for currently known object types.
  • the browser invokes steps to retrieve web objects stored on a remote server (step 611).
  • Figure 7, which is described in more detail below, illustrates the preferred steps for retrieving remotely stored web objects.
  • the bowser acts upon the retrieved web object (step 613).
  • Figure 7 illustrates the preferred steps for retrieving remotely stored web objects.
  • the browser builds a list of all the embedded objects in the web file that were not found in the cache.
  • the objects are preferably numbered by their sequential appearance in the web file (e.g., the first object is object 1, the second is object 2, etc.). If the object is referenced multiple times, it is preferably assigned the sequence number of its first reference in the file. Any object that does not have a PRIORITY attribute is preferably assigned a priority of zero.
  • the browser preferably sorts the list by descending priority as the primary sort key and ascending sequence number as the secondary sort key.
  • objects with a high priority will be sorted on top and objects with the same priority will be sorted such that the ones that are referenced early in the web file are sorted above those that are referenced later in the web file.
  • step 705 the browser initiates retrieval of the objects from the remote server(s), preferably in the order in which they appear on the sorted list.
  • processing ends in the method of Figure 7 but continues with step 613 of Figure 6 where the retrieved objects are acted upon (e.g., displayed, played, or executed).
  • Figure 8 illustrates the preferred steps for retrieving web objects in parallel. The steps of Figure 8 are performed as the preferred implementation of step 705 of Figure 7. Once retrieval of an object has started, the browser preferably determines whether to start retrieval of the next object on the list by the following rules:

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Transfer Between Computers (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
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EP97303915A 1996-06-10 1997-06-06 Procédé et dispositif pour le téléchargement prioritoire d'objets web encastrés Expired - Lifetime EP0813159B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US664048 1984-10-23
US08/664,048 US5826031A (en) 1996-06-10 1996-06-10 Method and system for prioritized downloading of embedded web objects

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EP0813159A2 true EP0813159A2 (fr) 1997-12-17
EP0813159A3 EP0813159A3 (fr) 1998-10-28
EP0813159B1 EP0813159B1 (fr) 2004-11-17

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EP (1) EP0813159B1 (fr)
JP (1) JPH10124413A (fr)
DE (1) DE69731581D1 (fr)

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DE69731581D1 (de) 2004-12-23
US5826031A (en) 1998-10-20
US6789075B1 (en) 2004-09-07
EP0813159B1 (fr) 2004-11-17
EP0813159A3 (fr) 1998-10-28

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